Computing-scale.



J, N. PERKINS. COMPUTING scum.

APPLICATION FILED MAR. 3, 19 11 7 1,004, 1 89, Patented Sept. 26, 1911.

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COMPUTING SCALE.

APPLICATION FILED MAR. s, 1911.

Patented Sept. 26, 1911.

3 SHEETS-SHEET 3.

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- ceiver, whereby .while a pendulum is also pivoted on the UNITED STATES PATENT OFFICE.

VIRGINIA, .ASSIGNOR TO RICHMOND SCALE RICHMOND, VIRGINIA.

JOHN NICHOLAS PERKINS, OF RICHMOND,

00., INCORPORATED, OF

COMPUTING-SCALE.

' Specification of Letters Patent. Application filed March 3, 1911.

The invention furthermore includes those novel features of construction, combination and arrangement of parts, all of which will be firstfully described,'and then be specifically pointed out in the appended claims, reference being had to the accompanying drawings, in which I Figure 1 is an end elevation of, the inven tion from the receiver end. Fig. 2 is a central vertical longitudinal section andpart elevation of the invention. Fig. 3 is a full size detail perspective view of the pendulum pivot Fig. 4 is a full size central vertical section of the cam, the cam pivot and the pendulum, showing their relative connections. Fig. 5 is a bottom view of the cam. Fig. 6 is an elevation of the gear segment and its counterbalance, a part of the gear segment being broken away. Fig. 7 is a front elevation, and Fig. 8 is a side elevation of the pendulum supporting member.

Referring now to the accompanying draw' ing, in which like numerals and letters in dicate like parts in all of the figures, 1 is the base of the scale on which the beam bearing standards 2 are mounted. The standards 2 have bearing blocks 3 to receive the knife edge bearing trunnions 5'of the scale beam 4-. The beam 4 is of the usual type, having a counterweight 6 at one end and an arm 40 at the other end that pro jects into the vertical housing 21 in which the pendulum, counterbalance and indicat ing scale, chart, etc, are mounted. The beam 4 has bearing members 7 on which the blocks 8 of the receiver standards 9 rest. The receiver includes the supporting frame 10 on which the receiver platform (usually a glass plate) 17 is mounted. It is the pres ent practice in the art, to provide an equal izer device for obtaining a movement of the receiver parallel to itself. As at presentpractice, it is the custom to run a rod vertically downward from the center of the I frame itself, into the base 1 where it pivotally connects with a pivoted link, the distance between the pivots of which is equal to the distance between the knife edges 7 and 5. By this construction it is necessary to elevate the base 1 considerably in order Patented Sept. 26, 1911. Serial No. 612,051.

To all whom it may concern.

Be it known that I, JOHN N. PERKINS, of Richmond, in the county of Henrico and State of Virginia,have invented a certain new and useful Computing-Scale, of which the following is a specification.

My invention is an improved computing scale of the pendulum type, and in its general nature the invention has for its object to provide a scale of a'simple and effective construction wherein the necessary adjustment of parts maybe made to render the scale accurate and sensitive in its operation, and it further includes an improved construction of equalizing device fol-the rcthe receiver may be located as closely as practicable to the counter or support on which the scale may be placed.

In carrying out my invention, I provide a pivotally mounted scale beam, one end of which is counterweighted and the other end 'of which is connected with the pendulum balancing mechanism; the receiver is pivoted to the beam, and in the preferred construction of the invention, carries what I term an upper back bar which projects up above the plane of the receiver and connects with a pivoted link within the vertical housing-of the scale.

The invention further includes a cam mounted to turn on the cam pivot, which pivot is mounted in suitable hearings in the vertical housing that is supported. on the scale supporting base. A counterbalanced gear segment is pinned to the pivot shaft and adjustably connected with the cam,

cam pivot shaft and projects into the cam to which it is adjustably connected so that I the cam and pendulum form, as it were, a rigid structure after the necessary adjustments have been made. A strap passes around the cam and carries a stirrup in which one end of the scale beam rests. The movement of. the gear segment is imparted through a pinion to a rotary chart which carries suitable computations and cooperates with a fixed indicator bar which is also supplied with-suitable computations, both the" bar and the indicator being visible through a transparent portion of the casing.

shaft and the parts mounted thereon.

to obtain the proper range of movement, thus throwing the receiver 17 a. considerable distance above the counter. This is an objectionable feature which I have overcome by the preferred construction of my invention. My improved equalizer cons.. jts of a bar 11 that projects into the housing from the frame 10, and-is then projecteiil ugwardly as at 12, and is pivoted at 14 to a link lwhich is pivoted at 16 in the projection 20 of the housing "21, the distance between. the pivots L l and 1.6 being substantially equal to that between the pivots 5 and T. If the bar 10 is run centrally to lie in the'ccntral longitudinal plane of the ap paratus, it may be slotted at 13 to permit passage/of the cam pivot shaft 28.

In order to reduce vibration and. cause the indica or chart 70 to come to rest promptly, a suitable dash pot 18 may be provided. and connected with the b03111 t. The housing or casing 21 may be provided with openings 19 which may be covered by transparent members 23 and 524 respectively, the transparent members icing held in place by rings-2 2 or in any other suitable manner. The transparent member 23 is slotted at 313 to permit passage of the arm '3' and is also slotted 2G to permit passage oi the beam linger l-O.

27 designates suitable bearing members in the housing 21 in which the bearing ends 29 of the cam and pendulum pivot 28 are mounted. The bear1ng ends 29 oi. the pivot 28 may be of any approved type, and although I have disclosed knife edge bearings 29, I do not desire to be limited thereto.

30 designates the cam which is loosely mounted on the shaft 28 and is chambered at 31 to receive the proji'acting end 4-2 of the pendulum carrier 4-1. The cam 30 includes the eccentric portion 3+1 around which the strap 35 passes, and to which at. the end of the strap is fastened. The cam 30 is also chambered at 32 to receive the eye of an eye bolt 52 which is pivoted in the chamber on a pin 51. The eye bolt projects through a slot 47 in the lug or projection 46 of the pendulum carrier 41, and is rigidly secured thereto by nuts 53 or their equivalents. lhe pendulun'i carrier 41 is bored and tapped to receive the pendulum rod 48 on which the weight 49'is adjustably mounted and secured by a suitable set screw 50. The strap 85 has its free end conneetedto a stirrup 3? which has a depression 38 to receive the bearing point 39 of the finger 40.

54 designates the gear segment which inserted at 55 into the wing 56 of the couutel-weight 57, the segment 54 being seem-ed in such recess by screws or other suitable devices. The weight and segment 54 are bored at 59 (see Fig. 6) to receive the shatt 28 to which the counterweight- 57.-.is secured a we in any desired manner, as by a pin 73 2 and ihe cam 30 is adjustably secured to the gear segment 54 and the wing 56 its counter night by a suitable connection, such as is disclosed best in Fig. oi. the drawings by reference to which it. will be observed the cam 30 is provided with a concentric slot- 33 through which a screw 61 passes. lhe screw (3] threads into a hole (50 (see Fig. ,6) in the segment 54 and wing 56, and carries washer 62 as indicated. By loosening the screw 61 the cam inay .Je turned on the shaft 28, and by tightening the screw 61 it may be rigidly held to the wing 56 and gear segment and thereby innnoyahly held on the shaft The gear scgme t has teeth which in sh with a. pinion on the shaft 65 that is mounted in suitable beai nos (36 on shafts 67 carried by the upp r section 68 of the vertical housing. The bear-- ings for the shaft 555 may be of any approved construction, but. I prefer to use bearings of the type disclosed in my copending apphc tion, filed February 18. 1910, Ser. hi0. 608,253. The upper section 68 of the housinc; may have t .nsparencics 39. whereby view of the bearings may be had so that the user may detect any inaccurz therein.

1'0 is the indicator chart, a part oi": which is visible through the transparent portion 72 oi. the casing (38, the chart 70 carrying suitable computations of the usual type.

71 is the i'xed indicator bar that cooperates with the chart or scale dial Y0. and is also suitably graduated in a manner vell known in the art.

in setting up the scale and adjusting the JflilLS. the ear segment 5e and ns counter h I we 54 are secured to the shaft 28 and toe weight 57 is cut dowii'or hdded to in the well known manner, until it exactly coin'ite"- balances the gear segment 54. The cam 30 is adjusted to its proper position with relation to the gear segment 5% and the pendulum carrier ii is adjusted to its proper position with relation to the cam 30 in a manner that will be readily apparent to those skilled in the art. in scales of this type, one. of the principal dilliculiies met with in practice is the adjustment oi parts so that the scale will weigh accurate and sensitively and also permit a uniform grachr ation oi the chart or dial 70.

It will be seen that with my construction, the :uljustuients can be readily and accu rately ell'cctcd and in a coir'paraiivciy short space of time. it will also be observed that the parts are so constructed as to embody a maximum strength without undue cumbersomencss. and turthcnnorc, should it hecome necessary to replace any of the parts such replacement may be (flit-(tied without great expense or loss oi" time.

having a rotatable shaft,

pivot and secured thereto, and a rotary scale shaft, and coiiperative connections between pendulous counterbalance and chart operating device, said device including a pivoted cam shaft, a gear segment fixed on said shaft and connection bet-ween said gear segment and said chart to operate same, a cam loosely mounted on said shaft, said cam having a pocket, a pendulum including a member projecting into said pocket and loosely mounted on said shaft, and adjustable connections between said member and said cam,

From the foregoing description taken in connection with the accompanying drawings, it is thought that the complete construction, operation and advantages of the invention will be readily understood by those skilled in the art to which the invention relates, and I desire it understood that changes in the design and details of construction of the parts may readily be made without departing from the invention.

\Vhat I claim is:-

1. In a scale, the combination with a cam pivot, of a cam mounted thereon and having an internal chamber, a pendulum mounted on said pivot and projecting into said cam chamber, a strap secured to said cam and passing around the same and then vertically downward, a beam mounted on a fulcrum, connections between said beam and said strap, a pan or platform mounted on said beam, an arm mounted on said cam caused to 'move together, and a strap having one end secured to said cam, passing over the same and connected with said beam.

6. In a computing scale, a computing table or chart, a scale beam, combined with a pendulous counterbalance and chart 0 crating device, said device including a pivoted cam shaft, a gear segment fixed on said shaft and connection between ment and said chart to operate the same, a cam loosely mounted on said shaft, said cam having a pocket, a pendulum including a member projecting into said pocket and loosely mounted on said shaft, and adjustable connections between said member and said cam, whereby said cam and said member may be caused to move together, a strap having one end secured to said cam, passing "over the same and connected with said beam; a receiver pivoted on said beam and having an arm projected in the direction of the beam and then upwardly past said cam shaft, and a pivoted link pivotally connected to the other end of said arm to cause said receiver to maintain a horizontal position.

7. In a scale, the combination with a scale beam and a rotary chart and its shaft, of a pivotally mounted cam shaft, a counterbalanced gear segment fixed to said cam shaft, operative connections between said gear seg ment and said chart shaft, a cam loosely mounted on said cam shaft and adjustably connected to said gear segment, said cam having an internal chamber, a pendulum carrier having a portion projecting into said chamber and loosely mounted on said cam shaft, said pendulum carrier having a projection, a bolt pivoted to said cam and passing through said projection, and means for operated by the movement of said arm, and means for connecting said cam to said arm, and means for connecting said pendulum and cam to move together.

2. In a computing scale, a pivoted shaft, a cam loosely mounted on said shaft, an arm fixedly mounted on said shaft, means for securing said cam to said arm, a pivoted scale beam, a strap having one end secured to said cam and passing around said cam and connected with said beam,-a pendulum pivoted on said shaft and adjustably con.- nected with said cam, and a pan or receiver mounted on said beam, and a scale chart operated by said arm.

3. In a computing scale, a pivoted beam, a pivoted shaft, a pendulum counterbalancing device on said shaft and connected with said beam, a rotary scale, a gear segment on said said scale and said gear segment, a receiver pivoted on said beam, alink pivoted in a plane above said receiver, said receivenhaving an arm projecting up to and pivotally connected with said link.

4. In a scale, a pivoted scale beam, a shaft pivoted in a plane above the beam pivot, a gear segment secured to said shaft, a chart gear connections between said chart shaft and said gear segment, a pendulum counter-balancing device on said first mentioned shaft, connections, between said device and said scale beam, a receiver pivoted on said scale beam, and located in a plane below said first mentioned shaft, a link pivotally mounted in a plane above said first mentioned shaft, and an arm carried by'said receiver and projecting upwardly past said first mentioned shaft and pivotally connected to said link.

5. In a computing scale, a computin table or chart, a scale beam, combined with a a rod mounted on said pendulum carrier and aweight mounted on said rod, thereby forming a pendulum in connection with said cam and having one end secured thereto and having its other end secured to said beam. i

8. In a scale, the combination with a cam pivot, of a cam loosely mounted to turn thereon, a pendulum loosely mounted on said pivot to turn thereon, and interengaging said cam, a strap secured to said cam and passing around the same and the:

whereby said 'cam and said member may be rigidly securing said bolt to said projection,-

said gear 'segcarrier, and a strap passing around said downwardly, a beam mounted on a fulcrum, connections between said beam and said strap, {L pan or platform mounted on said beam, an arm mounted'on said cam pivot and relatively fixedly secured thereto, a 1'0- tary scale operated by the movement of said arm. and means for edjustably connecting said cam to said arm, and means for ad cam.

JOHN NICHOLAS PERKINS. Witnesses:

J. C. KENT, RoBT. N. POLLARD. 

